Filter screen?

Does anybody know a good brand of filter for the intake on a lake sourced irrigation system? The current filter, which is about 18 years old, is a plastic cylinder 33" by 4" with razor-thin slits and a 1 1/2" galvanized nipple for coupling to a check valve. The filter recently cracked and started to suck sand until I patched it. I would like to find a replacement just like it, but there is no label and we did not install the system. Thanks for any ideas.

Thanks for all the suggestions. It sound like I need a screen regardless of any other exisitng problems.

The motor does seem to run hot to me. Its not so hot I can't place my hand on it but it does seem hot. (Of course were starting with 90 degrees here in Texas). It has a 2 HP motor and is "supposed" to be running on 240 V. I know I have 240 Volts out there but I have never pulled the cover off the box to see if the motor is actually wired to it. I didn't install it. Is it possible a 2 HP rated motor would even start and run normally ( for a while) for a while on 120 ?

A motor will get so hot that in 90 degree weather you won't want to hold your hand on it. This is normal. If you had a 2hp motor (a real 2 hp motor) wired for 115 volts and hit it with 230 volts, you would have long ago let the smoke out of it. If it were the other way around, it wouldn't have kept running for more than a few seconds then it would start running up and down trying to restart because of the lack of voltage.